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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 29, Iss. 6 — Mar. 15, 2004
  • pp: 575–577

Linewidth and tuning characteristics of terahertz quantum cascade lasers

A. Barkan, F. K. Tittel, D. M. Mittleman, R. Dengler, P. H. Siegel, G. Scalari, L. Ajili, J. Faist, H. E. Beere, E. H. Linfield, A. G. Davies, and D. A. Ritchie  »View Author Affiliations


Optics Letters, Vol. 29, Issue 6, pp. 575-577 (2004)
http://dx.doi.org/10.1364/OL.29.000575


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Abstract

We have measured the spectral linewidths of three continuous-wave quantum cascade lasers operating at terahertz frequencies by heterodyning the free-running quantum cascade laser with two far-infrared gas lasers. Beat notes are detected with a GaAs diode mixer and a microwave spectrum analyzer, permitting very precise frequency measurements and giving instantaneous linewidths of less than ~30 kHz . Characteristics are also reported for frequency tuning as the injection current is varied.

© 2004 Optical Society of America

OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3600) Lasers and laser optics : Lasers, tunable
(300.3700) Spectroscopy : Linewidth

Citation
A. Barkan, F. K. Tittel, D. M. Mittleman, R. Dengler, P. H. Siegel, G. Scalari, L. Ajili, J. Faist, H. E. Beere, E. H. Linfield, A. G. Davies, and D. A. Ritchie, "Linewidth and tuning characteristics of terahertz quantum cascade lasers," Opt. Lett. 29, 575-577 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-6-575

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